356 NEW YORK STATE MUSEUM 



species which have since been published under the same name but which 

 have no specific (and a very questionable generic) affinity with it. 



The first of these is Dr Emmons's Diplograptus secalinus 

 (Eaton) of 1856. 1 In the synonymy there given F u co i des simplex 

 Emmons [1844, above] is regarded as a synonym for and is suppressed in 

 favor of Professor Eaton's species. As pointed out above this view of the 

 affinities of Fucoides simplex, Emmons (of 1844) and Graptoli- 

 thus secalinus (Eaton) Hall (of 1847) is correct, but with this correct 

 synonymy Dr Emmons published figures of an entirely different species. 



Thirdly we have Mr Walcott's "Diplograptus ? simplex, 

 Emmons" 2 and (which is the same species) a different generic reference of 

 " P h y 1 1 o g r a p t u s ? simplex Emmons." 3 



Relative to this species Mr Walcott says : 4 



" Dr Emmons originally applied the name Fucoides simplex to a 

 species previously named by Professor Eaton as Fucoides secalinus. 

 Subsequently he referred the species named by him to Eaton's F. seca- 

 linus calling it Diplograptus secalinus, gave a description as 

 above, and at the same time figured another species which we have found 

 in the fine silicious shales of Parker's ledge. For this I have decided to 

 use Emmons's name simplex, the name D . secalinus being restricted 

 to the species from the Hudson River Group as described by Professor 

 Hall." 



Mr Walcott thus perceived the distinctness of Emmons's "Diplo- 

 graptus secalinus Eaton " of 1856 from the same author's simplex 

 of 1844 and its synonym Hall's secalinus (Eaton) of 1847. He believed 

 that he had rediscovered Emmons's secalinus of 1856 in the Parker's 

 ledge quarries and acting upon this belief proposed to apply Emmons's name 

 simplex to this species. An examination of his figure (and of the type 

 specimen) shows however that this species is entirely distinct from all the 

 others. 



In order to render this exceedingly complex synonymy clear the 

 following table is given : 

 simplex Emmons, no. 1 



simplex, Emmons, 1844, Tac. Syst. p. 2 7, t. 5, f. 1; Grapto- 



1 i th us (Fucoi'de s) secalinus (Eaton) Hall, 1847, Pal. N. Y. I, 



p. 267, t. 72, f. 2a-c ; includes as synonyms D. prist is (Hisinger) 



Hall, I). am p 1 ex i c au 1 i s Hall etc., etc. Horizon, Trenton to 



Lorraine. 



Proper name 1). simplex, Emmons 



•Emmons, Ebenezer. Am. Geol. pt 2, p.104, t. 1, f. ir. 



"Walcott, C 1). 18X6. U. S. Geol. Sur. Bui. 30. p. 92-93, t. 1 1, f. 4, 4.1. 



3 Walcott, C. D. 1889. Am. Jour. Sci. 37:388. 



* Loc. cit. p. 9 2. 



